Typewriter carbon sheet and attachment



- NOV. 14, 1933. l E. w M. THoMsoN 1,934,954 l TYPEWRITER CARBON SHEET AND ATTACHMENT Filed May 22, 1930 v31T El' .5

Patented Nov. 14, 1933 TYPEWRITER CARBON SHEET AND ATTACHMENT Edward W. M. Thomson, Toronto, Ontario, Canada Applicaties May 22, 1930. serial No.'454,626

1o Claims. (ci. la7-126) This invention relates to carbon sheets for typewriters used with what are known as fan or super-fold or continuous duplicating forms, that is in which super-imposed webs of paper are alternately folded in opposite directions to form a stack of original forms with underlying copy sheets. It is desirable, in typewriting such forms. to be able to use the same carbon sheets repeatedly and, to so support and actuate the sheets in the machine that they require no handling until they are worn out and need to be replaced. My object therefore is to devise means for attaining the desired result which may be either built into new machines or applied as an attachment to existing machines.

I attain my object by means of a construction which may be briefly' described as follows. A guide is supported on the machine above the forward side of the platen and through this guide Ythe super-imposed webs of paper are passed with carbon sheets interleaved. The carbon sheets are wider than the webs and the margins are strengthened, as, for example, by applying a ply of stiffer tougher material thereto. In each margin adjacent the lower edge of each sheet is provided a dog-engageable shoulder, preferably formed as an aperture in the margin. On the guide are pivoted dogs adapted to engage the shoulders formed by these apertures when in the feeding of the webs over the platen the end of a form has been reached. A fresh length of the webs can then be drawn up about the platen, while the carbon sheets are held by the dogs. The carbon sheets are thus positioned between a fresh set of forms after which the formsare brought back to the typing position by rotating the platen backwardly in the usual manner.

The dogs release themselves automatically from the aperturesin the carbon sheets as the forms are thus moved and the carbon sheets travel back with the fresh forms between which they have been positioned when held by the dogs as the webs were drawn up as previously described.

The invention is hereinafter more fully de'- scribed and is illustrated in the accompanying drawing in which Fig. 1 is a'front elevation of vpart of a typewriter provided with my attachment and with an'improved carbon sheet in position;

Fig. 2 a vertical cross section of the device;

Fig. 3 a plan view of the paper guide and carbon retaining device;

Fig. 4 a face view of a carbon sheet; and

A paper through the guide,

Fig. 5 is a vertical cross section of the carbon sheet shown in Fig. 4.

In the drawing like numerals of reference indicate corresponding parts in the diiferent fig- UIeS.

In the drawing only such part of the type' writer mechanism as is necessary for the proper understanding of the invention is illustrated.

Referring particularly to Figs. l and 2, 1 is the platen of the typewriter, and 2 the paper guide 65 extending from behind and round the platen to the frontv as usual.

My appliance includes a frame, which will vary in form according to the make of vtypewriter with which the device is used.

I show the frame as formed with end members 3, which may be attached to a suitable part of the typewriter frame, and preferably provided with rearwardly and upwardly extending portions 4 connected by a cross bar 5. Two or more 75 sets of holes are provided in the portions 4 so that the cross bar may be set at a greater or less height above the platen as may be desired. Over .this bar the webs of paper pass on their way to pass round the platen. On this bar are positioned two slides 6 provided with clamping screws '7 so that they may be clamped in any position to which they may be set. Each slide carries an arm 8 and in these arms are pivoted the ends of a bail 9` adapted to lie against the paper pass- 35 ing over the cross bar 5.

Extending from one end member 3 to the other is a guide, which comprises a stationary rear member 10 and a displaceable front member 11. The two members are held in spaced relationship by means of the spacers 12 between their ends to provide the necessary opening for the passage of the web of paper. The guide may be held in place in any convenient manner. but I show the part 10 as provided with projecting ends 10". At 95 one side of the apparatus the end 10a is passed through an' ropening formed in an upstanding flange of the adjacent end member 3. At the other side of the apparatus the end 10a is fitted into a notch formed in the upstanding ange of the end 10o member 3. The displaceable member 11 is pivoted on the stationary member adjacent the end 10 thereof first mentioned, and at its other end is provided with a projecting end 13 adapted to enter the notch hereinbefore referred. Ay spring finger 14 tends to hold the end 10a of the stationary member 10 in the said -notch. Thus, when desired, the displaceable member 11may be swung up to, facilitate the threading of the while the whole guidemay be removed when necessary by lifting the end adjacent the spring 14 and pulling the opposite end 10a of the member 10 out of the hole in the end member` 3 in which it is positioned when in use.

The upper edge of the guide is notched, as shown, this notch being of substantially the width of the paper webs to be used in the apparatus.

With the apparatus is used a carbon sheet 15 shown particularlyfin Figs. 4 and 5. This carbon sheet, it will be seen, is wider than the paper to.

be used with the apparatus so that, when in the apparatus, the ends lie under the ends of the guide at each side of the notch formed therein. The margins of the carbon sheet are stiffened or strengthened, the preferred method of effecting this being to gum a strip of fabric 16 along each margin. Each margin thus stiifened has a shoulder 17 formed therein, preferably by punching a hole through the margin and the fabric strip applied thereto. In alinement with these holes openings 24 are formed in the members 10 and 1i of the guide. Hinged above the openings 24 at each side are the dogs 19 which are preferably of the gravity type. These dogs 19 are preferably connected for simultaneous operation by the bar 20 having cranked ends 2l integral with the journals of the dogs 19. The ends of these dogs have preferably an inward and downward inclination so that, when positioned as shown in Fig. 2, they will resist further upward movement of the carbon sheet while they automatically disengage when the carbon sheet is moved in the opposite direction. y

The operation of the deviceissubstantially as follows. A web of paper 22 has the original forms printed thereon, and this web, together with one or more webs 23 for duplicate copies, is passed round the platen and up through the guide to bring the original form to the proper typing position. One or more carbon sheets are interpolated between the original and copy sheets according to the number of duplicates to be made. The paper and interleaved carbon sheet or sheets move up round the platen in the ordinary way until the end of the form is reached. At or about this time the openings 18 in the margins of the carbon sheet come into position to be engaged by the dogs 19 as shown in Fig. 2. The paper webs are now grasped and drawn up, to bring a fresh form into position. The carbon leaf or leaves are, however, held from movement during this operation so that ultimately they are positioned behind a new original form. The platen is then rotated backwards to bring the form to its initial typing position. During this movement the carbon leaf or leaves move with the paper, and are therefore properly positioned for the duplicating of the fresh original form. These series of operations are repeated until the end ofthe web of paper is reached, and one carbon sheet or set of sheets will usually serve for a web of originals of the v insertion of a fresh set of carbon sheets.

To facilitate the backward movement of the carbon sheets, the corners of the latter are preferably rounded off as shown in Fig. 4.

The device is shown in the drawing as attached to a standard Underwood typewriter. It will be understood, of course, that the device may be used on other makes of machines, although the method of attachment will require to be slightly varied to suit the particular machine.

From the above description it will be seen that I have devised an appliance which will satisfactorily attain the objects of my invention as set out above in this specification. i

What I claim as my invention is:

1. In a continuous billing attachment for use with travelling work webs and interleaved carbon sheets of greater width than the web and having holes in their extending portions adjacent the trailing ends thereof, the combination of a support; and movable means carried on said support normally adapted to ride on the carbon sheet extensions and to automatically engage in said holes to check the travel of the carbons while permitting continued movement of the Work webs.

2. In a continuous billing attachment for use with travelling work webs and interleaved carbon sheets of greater width than the web and having holes in their extending portions adjacent the trailing ends thereof, the combination of a support; and means pivoted on said support normally adapted to ride on the carbon sheet extensions and to automatically engage in said holes to check the travel of the carbons while permitting continued movement of the work webs.

3. In a continuous billing attachment for use with travelling work webs and interleaved carbon sheets of greater width than the web and having holes in their extending portions adjacent the trailing ends thereof, the combination of a support; and movable means carried on said support normally adapted to ride on the carbon sheet extensions and to automatically engage in said holes to check the travel of the carbons while permitting continued movement of the Work Webs, said means being shaped to be moved out of said holes by the carbon sheet when the latter is moved in the reverse direction.

4. In a continuous billing attachment for-use with travelling work webs and interleaved carbon sheets of greater width than the web and having holes in their extending portions adjacent the trailing ends thereof, the combination of a support; and means pivoted on said support normally adapted to ride on the carbon sheet extensions and to automatically engage in said holes to check the travel of the carbons while permittinglcontinued movement of the work Webs, said means being shaped to be moved out of said holes by the carbon sheet when the latter is moved in the reverse direction.

5. In a continuous billing attachment for use with travelling work webs and interleaved carbon sheets of greater width than the web and having holes in their extending portions adjacent the trailing ends thereof, the combination of a support formed as a work guide; and movable means carried on said support normally adapted to ride on the carbon sheet extensions and to automatically engage in said holes to check the travel of the carbons while permitting continued movement of the work webs.

6. In a continuous billing attachment for use with travelling work webs and interleaved carbon sheets of greater width than the web and having holes in their extending portions adjacent the trailing ends thereof, the combination oi' a support formed as a work guide; and movable means ment of the work Webs, said means being shaped' to be moved out of said holes by the carbon sheet when the latter is moved in the reverse direction.

holes in theirl extending po 7. In a continuous billing attachment for use with travelling work webs and interleaved carbon sheets of greater width than the web and having l ons adjacent the trailing ends thereof, the com ination oi?I a support formed as a work guide, said guide being sheets of greater widththan the web and havingholes in their extending portions adjacent the 'trailing ends thereof, the combination oi. a support; and 'gravity dogs carried on said support normally adapted to ride on the carbon sheet extensions and to automatically engage in said holes lto check the travel of the carbons while permitting continued movement ot the work webs.

9. In a continuous billing attachment for luse with travelling work webs and interleaved carbon sheets of greater width than the web and having holes in their extending portions adjacent the trailing ends thereof, the combination of a slupport; and gravity dogs carried on said support normally adapted to ride on the carbon sheet extensions and to automatically engage in said 'holes to check the travel of the carbons while permitting continued movement of the work webs, said dogs being shaped to be moved out oi' said holes by the carbon sheet when the latter is moved in the reverse direction.

10.-In a typewriting machine, in combination.`

duplicating means shii'table with record strips; anda checking member at 'thedelivery side oi' the platen. said duplicating means having a surface over which saidV checking member mayfride Afollowed by`a checking aperture adapted to receive said checking member. 

